Sorry for the slow reply. Have just had some surgery that went a bit 'wrong'.
I like them. There are no weight concerns. No noticeable change that way.
They do seem to have made my violin 'louder' and I am assuming that is because of the lack of fine tuners on the tailpiece.
I would recommend them.
Seen it all. Done it all. Can't remember most of ..... What was I saying????